Mercedes-Benz bulletin LI82.85-P-076800
What it saysThe "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Oct 10, 2023, received Nov 3, 2023, about the electrical system. It names 101 model years (2017–2022). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThe "SOS nonfunctional" message appears sporadically in the instrument cluster of the vehicle. The fault code B129C00 is stored in the control unit log. The message occurs in particular after the vehicle has been non-operational for an extended period of time; the message then disappears of its own accord after a few minutes. No functional limitation to the emergency call system is to be expected. Software error in N112/9 control unit for telematics services (HERMES). Software update for control unit N112/9 - Control unit for telematics services (HERMES) to software release E522.8. If, against expectations, the erroneous display of the message in the instrument cluster continues to occur following the update, please create a TIPS case.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI82.85-P-076800 | Service bulletin | Oct 10, 2023 | 10244837 | PDF, 39 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
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Model years it names
Source: as the manufacturer filed themand 42 more on this site: 2022 Mercedes-Benz GLA-Class, 2021 Mercedes-Benz GLA-Class, 2020 Mercedes-Benz GLA-Class, 2019 Mercedes-Benz GLA-Class, 2018 Mercedes-Benz GLA-Class, 2017 Mercedes-Benz GLA-Class, 2022 Mercedes-Benz GLB-Class, 2021 Mercedes-Benz GLB-Class, 2020 Mercedes-Benz GLB-Class, 2022 Mercedes-Benz GLC-Class, 2021 Mercedes-Benz GLC-Class, 2020 Mercedes-Benz GLC-Class, 2019 Mercedes-Benz GLC-Class, 2018 Mercedes-Benz GLC-Class, 2017 Mercedes-Benz GLC-Class, 2022 Mercedes-Benz GLE-Class, 2021 Mercedes-Benz GLE-Class, 2020 Mercedes-Benz GLE-Class, 2019 Mercedes-Benz GLE-Class, 2018 Mercedes-Benz GLE-Class, 2017 Mercedes-Benz GLE-Class, 2022 Mercedes-Benz GLS-Class, 2021 Mercedes-Benz GLS-Class, 2020 Mercedes-Benz GLS-Class, 2019 Mercedes-Benz GLS-Class, 2018 Mercedes-Benz GLS-Class, 2017 Mercedes-Benz GLS-Class, 2022 Mercedes-Benz S-Class, 2021 Mercedes-Benz S-Class, 2020 Mercedes-Benz S-Class, 2019 Mercedes-Benz S-Class, 2018 Mercedes-Benz S-Class, 2017 Mercedes-Benz S-Class, 2022 Mercedes-Benz SL-Class, 2020 Mercedes-Benz SL-Class, 2019 Mercedes-Benz SL-Class, 2018 Mercedes-Benz SL-Class, 2017 Mercedes-Benz SL-Class, 2020 Mercedes-Benz SLC-Class, 2019 Mercedes-Benz SLC-Class, 2018 Mercedes-Benz SLC-Class, 2017 Mercedes-Benz SLC-Class.
Also filed against model years this site has no page for: 2018 Mercedes-Benz A 220; 2020 Mercedes-Benz AMG A45; 2022 Mercedes-Benz AMG C63 S; 2021 Mercedes-Benz AMG E53 S; 2022 Mercedes-Benz AMG E63; 2022 Mercedes-Benz AMG E63S; 2017 Mercedes-Benz AMG GT C Roadster; 2020 Mercedes-Benz AMG GT S; 2020 Mercedes-Benz AMG GT43; 2022 Mercedes-Benz AMG GT63; 2022 Mercedes-Benz AMG GT63 S; 2018 Mercedes-Benz AMG GTA; 2022 Mercedes-Benz AMG SL43; 2019 Mercedes-Benz AMG SL65; 2020 Mercedes-Benz EQC 400; 2021 Mercedes-Benz EQC 400 E; 2018 Mercedes-Benz S 550; 2019 Mercedes-Benz S 550; 2020 Mercedes-Benz S 550.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 82 model years this bulletin names have filed 2,817 complaints with NHTSA since 2015. 539 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
On the 2020 Mercedes-Benz GLE-Class, the 13 owners who gave an odometer reading for Electrical System reported it at a median of 6,615 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2020 Mercedes-Benz CLS450. The contact received notification of NHTSA Campaign Number: 22V533000 (Electrical System) however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2020 Mercedes-Benz CLS-Class · Electrical System · filed with NHTSA Aug 24, 2022 · ODI 11481015
this car really has a lot of issues and honestly if I didn’t know what to do last night and didn’t know about cars, it could have seriously cost me my life but luckily I was able to move out the way of a truck that was coming fast behind me while I was at a traffic light and when the light turned green the car would not start back up…
2022 Mercedes-Benz GLB-Class · Electrical System · filed with NHTSA Aug 10, 2024 · ODI 11607732
As I approached a red light and removed my foot from the gas pedal to brake, my dashboard displayed several alarming messages: “Active Brake Assist Functions Limited See Owner's Manual,” “Active Blind Spot Assist Inoperative,” “To Deselect P or N Depress Brake and Start Engine,” and “Traction Control Inoperative See Owner's Manual.”…
2022 Mercedes-Benz GLS-Class · Electrical System · filed with NHTSA Jun 4, 2024 · ODI 11592527
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group271 other manufacturer communications filed against these Mercedes-Benz models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI47.70-P-079912 | Service bulletin | Sep 29, 2026 | Complaint Vehicle will not start after DC charging Warning in the instrument cluster related to High‑voltage on board electrical system The… |
| LI46.00-P-081006 | Service bulletin | Sep 29, 2026 | Complaint The vehicle pulls to the left or right. Cause In vehicles with Car Package Release "CPR" 2.1.0 or prior, the calibration value for… |
| LI54.71-P-080956 | Service bulletin | Sep 25, 2026 | Complaint 174 with MB. OS 2.1.1 ‑ Driver Assistance System Limited in Instrument Cluster and Does Not Self‑Extinguish. When vehicle is shut… |
| ANN - Tech. Aware. G580e | Other | Sep 21, 2026 | Tech. Awareness: G580e 465.600/465.601 - ISU For Model G580e 465.600/465.601 - Please be aware that initial start up of N147/10n1, N147/10n2… |
| LI54.30-P-080963 | Service bulletin | Sep 17, 2026 | Complaint Issue after OTA Update IC Odometer Reading blank("_ _ _ _") IC Maintanence data unavailable Cause OTA Update E61.0 Remedy In the I… |
| LI54.10-P-080684 | Service bulletin | Sep 17, 2026 | Complaint When disconnecting or connecting the charging connector, the charging socket flashes red and red warning messages are displayed in… |
| LI82.60-P-080383 | Service bulletin | Sep 15, 2026 | Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of up… |
| NCU - 2026090001 | Service campaign | Sep 11, 2026 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mercedes-Benz, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz LI82.85-P-076800 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the LI82.85-P-076800 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every Mercedes-Benz warranty extension on file lists the ones Mercedes-Benz has filed.
Which vehicles does LI82.85-P-076800 cover?
The manufacturer filed it against 101 model years: 2022 Mercedes-Benz A-Class, 2021 Mercedes-Benz A-Class, 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2022 Mercedes-Benz AMG GT, 2021 Mercedes-Benz AMG GT and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.